@keyframes flipInX {
    from {
        transform: perspective(400px) rotate3d(1, 0, 0, 90deg);
        animation-timing-function: ease-in;
        opacity: 0;
    }

    40% {
        transform: perspective(400px) rotate3d(1, 0, 0, -20deg);
        animation-timing-function: ease-in;
    }

    60% {
        transform: perspective(400px) rotate3d(1, 0, 0, 10deg);
        opacity: 1;
    }

    80% {
        transform: perspective(400px) rotate3d(1, 0, 0, -5deg);
    }

    to {
        transform: perspective(400px);
    }
}

.flipInX {
    backface-visibility: visible !important;
    animation-name: flipInX;
}
